组合框items.count犯规匹配的数据源（C＃） [英] ComboBox items.count doesnt match datasource (C#)

问题描述

我有一个绑定到一个数据源组合框。我要动态地添加项目在一定条件下的组合框。所以我所做的就是添加选项到一个新的列表，然后改变ComboBox的数据源，像这样：

I have a ComboBox that is bound to a DataSource. I want to dynamically add items to the ComboBox based on certain conditions. So what I've done is add the options to a new list, and then change the DataSource of the ComboBox like so:

cbo.DataSource = null;
cbo.DataSource = cbos;
cbo.DisplayMember = "Title";
cbo.ValueMember = "Value";

然后，我检查 cbo.Items.Count ，现在也没有增加 - 这不等于数据源的数量。任何想法我能做些什么吗？请注意，这是WinForms和不asp.net。

Then, I check cbo.Items.Count, and it has not incremented - it does not equal the count of the DataSource. Any ideas what I can do here? Note this is WinForms and not asp.net.

感谢

推荐答案

如果有人经历一个动态添加组合框这个问题，答案是，以确保您的组合框添加到表单中容器的控制。

If anyone experiences this problem on a dynamically added combobox, the answer is to ensure that you add the combobox to the controls of a container in the form.

通过添加 this.Controls.Add（CBO）;要设置数据源代码之前，这个问题就会消失。

By adding "this.Controls.Add(cbo);" to the code before setting the datasource, the problem goes away.

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